ML20076K682

Ro:On 830904,HPCI Min Flow Return to Torus Line Throttle Valve Found Opening Intermittently.Later,Rcic Outboard Isolation Valve Would Not Close.Causes Not Stated.Limiting Condition for Operation Declared & Orderly Shutdown Begun

ML20076K682
Person / Time
Site:	Duane Arnold
Issue date:	09/06/1983
From:	Mineck D IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
DAEC-83-724, NUDOCS 8309150232
Download: ML20076K682 (1)

Text

lowa Electric 1.ight anti Ibwer Compmy September 6, 1983 DAEC-83-724 Mr. James G. Keppler Regional Administrator Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

Duane Arnold Energy Center Op. License No. DPR-49 Docket No. 50-331 Prompt Notification of a Reportable Occurrence

Dear Mr. Keppler:

This letter telecopied to your office, provides written confirmation of a prompt notification pursuant to DAEC Technical Specifications, Appendix A, Section 6.11.2.a.7.

On 9/4/83, the HPCI minimum flow return to torus line throttle valve was found to be opening intermittently. HPCI was declared inoperable at 1105 hours0.0128 days <br />0.307 hours <br />0.00183 weeks <br />4.204525e-4 months <br /> due to this problem and a seven day LC0 was entered. On 9/4, while conducting the daily operability test required by T.S. 4.5.D.2, it was determined that the RCIC outboard isolation valve would not close. The inboard valve was closed and RCIC declared inoperable. A 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> LC0 was declared in accordance with T.S. 3.5.D.3 and an orderly shutdown initiated.

An unusual event was declared and notifications were made to the NRC pursuant to Technical Specification 6.11.2.a and 10 CFR 50.72.

Very truly yours,

/

Daniel L. Mineck Plant Superintendent - Nuclear Duane Arnold Energy Center DLM/DRK/pf cc: NRC Resident Inspector R. McGaughy File: A-ll8a 8309150232 030906  ! 4 Ik PDR ADOCK 05000331 S PDR SEP 91!B3 Iksstu= Artushi Dw'agr Cerste'r

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